These Killer Instinct INTENSE SELECT Carbon Arrows feature the premium quality and performance that serious archers demand. The INTENSE SELECT series uses 100% carbon construction with exceptional spine consistency. Each shaft is laser sorted and matched for straightness to +/- 0.001" for maximum consistency - the tightest tolerance available. 32.5" uncut length fletched with 2" vanes, .244" inner diameter, 7.25 GPI for 400 spine, and tunable nocks. Designed for vertical bows only and not compatible with crossbows. Uncut length allows custom fitting to your draw length. Also available in 340 spine (8.5 GPI) and 500 spine (6.39 GPI) for different bow setups.